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          <h1 class="post-title" itemprop="name headline">Python3判断字符中英文数字符号</h1>
        

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<p>第一篇博客，写一下关于Python3中字符中英文数字符号的判断。</p>
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<p>师姐给的一个任务，涉及到中英文混杂的文档集合，因而需要判断文本字符是中文还是英文。关于字符中文英的判断，网上一搜一大堆，但是拿过来一用就各种bug。主要原因是很多人给出的是Python2的代码，然后其中关于字符编码的问题，Pyhton2和Python3是不一样的。</p>
<p>判断字符中英文的方法一般是将字符放在Unicode编码中进行进行比较从而判断。</p>
<p>例如Unicode编码中中文的编码范围是’4e00’到’9fa5’，不过网上大多数的写法是：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">is_chinese</span><span class="params">(uchar)</span>:</span></span><br><span class="line">    	<span class="keyword">if</span> uchar &gt;= <span class="string">u'u4e00'</span> <span class="keyword">and</span> uchar&lt;=<span class="string">u'u9fa5'</span>:</span><br><span class="line">     		<span class="keyword">return</span> <span class="keyword">True</span></span><br><span class="line">    	<span class="keyword">else</span>:</span><br><span class="line">            	<span class="keyword">return</span> <span class="keyword">False</span></span><br></pre></td></tr></table></figure>
<p>这里使用的u’u4e00’在Python3中行不通，正确的写法应该是：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">is_chinese</span><span class="params">(char)</span>:</span></span><br><span class="line">   <span class="keyword">if</span> char &gt;= <span class="string">'\u4e00'</span> <span class="keyword">and</span> char &lt;= <span class="string">'\u9fa5'</span>:</span><br><span class="line">           <span class="keyword">return</span> <span class="keyword">True</span></span><br><span class="line">   <span class="keyword">else</span>:</span><br><span class="line">           <span class="keyword">return</span> <span class="keyword">False</span></span><br></pre></td></tr></table></figure>
<p>同样，判断字符是否为英文字母：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">is_alphabet</span><span class="params">(char)</span>:</span></span><br><span class="line">        <span class="keyword">if</span> (char &gt;= <span class="string">'\u0041'</span> <span class="keyword">and</span> char &lt;= <span class="string">'\u005a'</span>) <span class="keyword">or</span> (char &gt;= <span class="string">'\u0061'</span> <span class="keyword">and</span> char &lt;= <span class="string">'\u007a'</span>):</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">True</span></span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">False</span></span><br></pre></td></tr></table></figure>
<p>判断字符是否为数字：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">is_number</span><span class="params">(char)</span>:</span></span><br><span class="line">        <span class="keyword">if</span> char &gt;= <span class="string">'\u0030'</span> <span class="keyword">and</span> char &lt;= <span class="string">'\u0039'</span>:</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">True</span></span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">False</span></span><br></pre></td></tr></table></figure>
<p>判断字符是否非汉字，数字和英文字符：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">is_other</span><span class="params">(uchar)</span>:</span></span><br><span class="line">        <span class="keyword">if</span> <span class="keyword">not</span> (is_chinese(uchar) <span class="keyword">or</span> is_number(uchar) <span class="keyword">or</span> is_alphabet(uchar)):</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">True</span></span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">False</span></span><br></pre></td></tr></table></figure>
<p>完整代码=&gt;<a href="https://github.com/LeoWood/AuxiliaryScripts" target="_blank" rel="noopener">GitHub-AuxiliaryScripts-DistinguishChars.py</a>.</p>

      
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